Previously, we showed that silicon-substituted norbornenes and norbornadienes can be widely used for synthesizing macromolecular structures with regularly changed substituents with the aim of revealing theoretically and practically important structure-property relationships [1]. It turned out that polynor-bornenes containing trimethylsilyl side groups have good gas transport properties and can serve as efficient membrane materials [2]. We showed that it is precisely Me3Si substituents that are responsible for the gas-separation properties and an increase in their number in the monomeric unit enhances the permeability coefficients of polymers. When studying the synthesis of polycarbosilanes of this type, we demonstrated that norbornene and norbornadiene with two SiMe3 substituents, being active monomers in metathesis polymerization, are almost not polymerized by the addition (vinyl) scheme (Scheme 1). An analogous problem for fluoro-substituted norbornenes was described in [3].
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